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(a) Self-healing mechanisms of poly(acrylic acid)–cellulose nanofibrils–Fe3+ (PAA–CNF–Fe3+) by the synergy of H-bonds and dual coordinate bonds. (Reproduced with permission [107] from American Chemical Society). (b) Self-healing polymers that were designed via combined H-bonding and Zn–imidazole interactions. (Reproduced with permission [111] from Elsevier).
